Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	$ 740,189				$ 896,245				$ 740,189	$ 896,245	$ 890,925
Net sales	316,733	309,577	291,194	307,530	310,592	302,483	272,702	272,015	1,225,034	1,157,792	1,071,504
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									675,771	615,861	522,393
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	425,733				576,539				425,733	576,539	479,791
OtherCountries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									615,974	602,582	611,899
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	314,456				319,706				314,456	319,706	411,134
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile									(66,711)	(60,651)	(62,788)
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	$ 0				$ 0				$ 0	$ 0	$ 0